Actual and forecasted sales for a soft$-$serve ice cream shop are shown in the table below for the last $8$ weeks.

a$.$ Fill in the absolute error column. Round all answers to $1$ decimal. If the answer is $0,$ do not leave the cell blank, enter a $0.$

$\backslash$table$[[$Week$,$Actual Sales,Forecast,Absolute Error$],[1,294,,],[2,228,,],[3,311,,],[4,327,277\mathrm{.}7,],[5,360,288\mathrm{.}7,],[6,339,332\mathrm{.}7,],[7,371,342,],[8,404,356\mathrm{.}7,]]$

b$.$ Calculate mean absolute deviation $($MAD$)$ for this forecast. Round your answer to $1$ decimal.

Mean absolute deviation for this forecast $=$